Book excerpt: "Based on an international review of the key strategy problems faced by over one hundred leading companies, Courtney reveals how executives can develop 20/20 foresight - a view of the future that separates what can be known from what can't. While executives with 20/20 foresight can rarely develop perfect forecasts of the future, says Courtney, they can isolate the "residual uncertainty" they face and use this insight to create competitive advantage in today's turbulent markets."--BOOK JACKET.